Jaspen- my gf just told me sydney is suppose to be 30 on friday (not sure when u r going up) i just went to Bom website to check it out;
Saturday Fine. Mostly sunny.
City: Min: 17 Max: 28
West: Min: 13 Max: 30

Sunday Fine.
City: Min: 18 Max: 27
West: Min: 14 Max: 28

Monday Fine.
City: Min: 13 Max: 22
West: Min: 8 Max: 22

Tuesday Fine.
City: Min: 13 Max: 23
West: Min: 8 Max: 23